"Approximately 100,000 tons of ore would be mined over seven...

"Approximately 100,000 tons of ore would be mined over seven years. The maximum production of ore over a two-week period would be 4,000 tons."

Basil,

Fairly complex methodology, more simply put:

100,000t x 0.3% = 300t
1 tonne = 2204.62262 lbs
300 x 2204.62262 = 661,387 lbs

So they have set a goal of mining maximum 100,000 tons of ore per annum, to produce 661,387 lbs of u3o8 per annum for 7 years

Now we wait to see what deal they work out with Dennison